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參數資料
| 型號： | MC4GH02GNMCA-2SA00 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | SAMSUNG MultiMediaCard |
| 中文描述： | 三星多媒體 |
| 文件頁數： | 71/102頁 |
| 文件大小： | 1384K |
| 代理商： | MC4GH02GNMCA-2SA00 |
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MultiMediaCard
TM
71
Sep.22.2005
Revision 0.3
6.11 Memory Array Partitioning
The basic unit of data transfer to/from the MultiMediaCard is one byte. All data transfer operations which require a block
size always define block lengths as integer multiples of bytes. Some special functions need other partition granularity.
For block oriented commands, the following definition is used:
Block
: is the unit which is related to the block oriented read and write commands. Its size is the number of bytes which
will be transferred when one block command is sent by the host. The size of a block is either programmable or fixed. The
information about allowed block sizes and the programmability is stored in the CSD.
For R/W cards, special erase and write protect commands are defined:
The granularity of the erasable units is the
Erase Group:
The smallest number of consecutive write blocks which can be
addressed for erase. The size of the Erase Group is card specific and stored in the CSD.
The granularity of the Write Protected units is the
WP-Group:
The minimal unit which may be individually write protected.
Its size is defined in units of erase groups. The size of a WP-group is card specific and stored in the CSD.
MultiMediaCard
Write Protect Group 1
Erase Group 0
Erase Group 1
Write Block 1
Write Block n
Write Block 3
Write Block 2
Write Block 0
Erase Group 2
Erase Group n
Erase Group 3
Write Protect Group 0
Write Protect Group 2
Write Protect Group n
Figure 6-5 : Memory Array Partitioning
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